Princeton's WordNet

1. special(noun)

   a special offering (usually temporary and at a reduced price) that is featured in advertising

   Antonyms:
   general, nonspecific, unspecialized, unspecialised, scheduled, common, secondary, ordinary

2. special(noun)

   a dish or meal given prominence in e.g. a restaurant

   Antonyms:
   common, secondary, nonspecific, general, ordinary, scheduled, unspecialised, unspecialized

3. special(adj)

   a television production that features a particular person or work or topic

   Antonyms:
   ordinary, scheduled, unspecialized, nonspecific, secondary, common, general, unspecialised

4. particular(a), peculiar(a), special(a)(adj)

   unique or specific to a person or thing or category

   Antonyms:
   ordinary, unspecialised, unspecialized, common, general, secondary, nonspecific, scheduled

5. special(adj)

   for a special service or occasion

   Synonyms:
   especial(a), limited, particular(a), peculiar(a), particular, special(a), exceptional, extra

   Antonyms:
   unspecialised, common, general, scheduled, nonspecific, unspecialized, secondary, ordinary

6. especial(a), exceptional, particular(a), special(adj)

   surpassing what is common or usual or expected

   Antonyms:
   scheduled, unspecialised, nonspecific, general, common, ordinary, unspecialized, secondary

7. special(adj)

   adapted to or reserved for a particular purpose

   Synonyms:
   especial(a), limited, particular(a), peculiar(a), particular, special(a), exceptional, extra

   Antonyms:
   nonspecific, general, scheduled, unspecialised, ordinary, unspecialized, common, secondary

8. limited, special(adj)

   having a specific function or scope

   Synonyms:
   especial(a), limited, modified, particular(a), peculiar(a), circumscribed, particular, special(a), exceptional, special, extra

   Antonyms:
   general, ordinary, secondary, nonspecific, common, scheduled, unspecialised, unspecialized

9. particular, special(adj)

   first and most important

   Synonyms:
   especial(a), finical, picky, particular(a), peculiar(a), limited, fussy, finicky, particular, special(a), exceptional, special, extra

   Antonyms:
   scheduled, general, nonspecific, unspecialised, unspecialized, ordinary, secondary, common

10. extra, special(adj)

    added to a regular schedule

    Synonyms:
    superfluous, surplus, special(a), peculiar(a), excess, spare, extra, supererogatory, redundant, supernumerary, limited, particular, additional, special, especial(a), particular(a), exceptional

    Antonyms:
    ordinary, nonspecific, unspecialized, common, general, secondary, scheduled, unspecialised